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402 lines
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<title>Kapitel 04: __str__ und Darstellung</title>
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<link rel="stylesheet" href="../../assets/style.css">
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<div class="sidebar-group-title">
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<span>🌱 1. Grundlagen</span>
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<span style="background: rgba(255,255,255,0.1); padding: 2px 6px; border-radius: 99px; font-size: 0.7rem;">G01–G10</span>
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<div style="display: flex; flex-direction: column; gap: 2px;">
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<a href="../../lehrpfad_1_grundlagen/01_erste_schritte_taschenrechner/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🧮</span>
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<span class="sidebar-link-text">G01. Taschenrechner</span>
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<span class="sidebar-link-icon">📦</span>
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<span class="sidebar-link-text">G02. Variablen & Typen</span>
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<a href="../../lehrpfad_1_grundlagen/03_ein_und_ausgabe/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">💬</span>
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<span class="sidebar-link-text">G03. Ein- & Ausgabe</span>
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<span class="sidebar-link-icon">🚦</span>
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<span class="sidebar-link-text">G04. Bedingungen (if)</span>
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<span class="sidebar-link-icon">🎡</span>
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<span class="sidebar-link-text">G05. Schleifen (for/while)</span>
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<span class="sidebar-link-icon">🪄</span>
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<span class="sidebar-link-text">G06. Funktionen & Module</span>
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<span class="sidebar-link-icon">📋</span>
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<span class="sidebar-link-text">G07. Listen & Sequenzen</span>
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<a href="../../lehrpfad_1_grundlagen/08_textverarbeitung_und_strings/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🔤</span>
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<span class="sidebar-link-text">G08. String-Methoden</span>
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<a href="../../lehrpfad_1_grundlagen/09_dictionaries_und_sets/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🗃️</span>
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<span class="sidebar-link-text">G09. Dicts & Sets</span>
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</a>
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<a href="../../lehrpfad_1_grundlagen/10_comprehensions_datum_algorithmen/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🚀</span>
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<span class="sidebar-link-text">G10. Comprehensions</span>
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</div>
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</div>
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<div class="sidebar-group">
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<div class="sidebar-group-title">
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<span>🏗️ 2. OOP Einstieg</span>
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<span style="background: rgba(255,255,255,0.1); padding: 2px 6px; border-radius: 99px; font-size: 0.7rem;">00–06</span>
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</div>
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<div style="display: flex; flex-direction: column; gap: 2px;">
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<a href="../../lehrpfad_2_oop_einstieg/00_fehlersuche_und_grundlagen/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🔍</span>
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<span class="sidebar-link-text">00. Fehlersuche & Debug</span>
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</a>
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<a href="../../lehrpfad_2_oop_einstieg/01_einstieg_klassen/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🏗️</span>
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<span class="sidebar-link-text">01. Einstieg in Klassen</span>
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<a href="../../lehrpfad_2_oop_einstieg/02_init_und_self/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">⚙️</span>
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<span class="sidebar-link-text">02. Konstruktor & self</span>
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</a>
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<a href="../../lehrpfad_2_oop_einstieg/03_methoden_und_verhalten/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🏎️</span>
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<span class="sidebar-link-text">03. Methoden & Verhalten</span>
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</a>
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<a href="../../lehrpfad_2_oop_einstieg/04_str_und_darstellung/index.html" class="sidebar-link active">
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<span class="sidebar-link-icon">🧾</span>
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<span class="sidebar-link-text">04. __str__ Darstellung</span>
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</a>
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<a href="../../lehrpfad_2_oop_einstieg/04b_umstieg_vscode/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">💻</span>
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<span class="sidebar-link-text">04b. VS Code Setup</span>
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</a>
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<a href="../../lehrpfad_2_oop_einstieg/04c_git_und_versionskontrolle/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🌿</span>
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<span class="sidebar-link-text">04c. Git-Versionskontrolle</span>
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</a>
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<a href="../../lehrpfad_2_oop_einstieg/05_objekte_kombinieren/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🎵</span>
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<span class="sidebar-link-text">05. Objekte kombinieren</span>
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<a href="../../lehrpfad_2_oop_einstieg/06_abschlussprojekt_tamagotchi/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🥚</span>
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<span class="sidebar-link-text">06. Projekt: Tamagotchi</span>
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<div class="sidebar-group">
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<div class="sidebar-group-title">
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<span>🚀 3. Fortgeschritten</span>
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<span style="background: rgba(255,255,255,0.1); padding: 2px 6px; border-radius: 99px; font-size: 0.7rem;">07–16</span>
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</div>
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<div style="display: flex; flex-direction: column; gap: 2px;">
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/07_referenzen_und_speicher/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🧠</span>
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<span class="sidebar-link-text">07. Referenzen & Speicher</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/08_operator_overloading_dunder/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">➕</span>
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<span class="sidebar-link-text">08. Operator Overloading</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/09_eigene_unit_tests_schreiben/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🧪</span>
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<span class="sidebar-link-text">09. Unit Tests & TDD</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/10_vererbung_und_super/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🧬</span>
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<span class="sidebar-link-text">10. Vererbung & super()</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/11_polymorphie_und_interfaces/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🎭</span>
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<span class="sidebar-link-text">11. Polymorphie</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/12_exceptions_und_fehlerbehandlung/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🛡️</span>
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<span class="sidebar-link-text">12. Exceptions & Fehler</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/13_persistenz_json_und_csv/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">💾</span>
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<span class="sidebar-link-text">13. Persistenz (JSON/CSV)</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/14_gui_mit_tkinter/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🖥️</span>
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<span class="sidebar-link-text">14. Desktop-GUIs (Tkinter)</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/15_parameter_und_container/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🎒</span>
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<span class="sidebar-link-text">15. Container & *args</span>
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</a>
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<a href="../../lehrpfad_3_fortgeschrittenes_oop/16_master_abschlussprojekt/index.html" class="sidebar-link">
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<span class="sidebar-link-icon">🏆</span>
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<span class="sidebar-link-text">16. Master-Abschlussprojekt</span>
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</a>
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</div>
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</div>
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</div>
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<div class="sidebar-footer">
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<div style="display: flex; align-items: center; justify-content: space-between;">
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<div style="font-size: 0.85rem; font-weight: 700; color: white;" id="sidebar-level-text">⭐ Level 1</div>
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<div style="font-size: 0.82rem; font-weight: 700; color: #38bdf8;" id="sidebar-xp-text">0 XP</div>
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</div>
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</div>
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</aside>
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<header>
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<div class="header-container">
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<nav class="nav-links">
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<a href="../../index.html">🏠 Zur Kursübersicht</a>
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<span>›</span>
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<a href="../03_methoden_und_verhalten/index.html">Kapitel 03</a>
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<span>›</span>
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<span style="color: white; font-weight: 600;">Kapitel 04</span>
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</nav>
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<div class="header-badge">Kapitel 04</div>
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<h1>Schöne Ausgaben mit <code>__str__</code> & Objektlisten 🧾</h1>
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<p>Lerne anhand eines Pizzeria-Beispiels, wie du <code>print(objekt)</code> formatierst und Objekte in Listen sammelst.</p>
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</div>
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</header>
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<main class="container">
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<!-- 📂 Schnellzugriff & Download aller Dateien dieser Einheit -->
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<div style="background: #ffffff; border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 14px 20px; margin-bottom: 25px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; box-shadow: var(--shadow-sm);">
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||
<div style="font-weight: 700; color: var(--text-main); display: flex; align-items: center; gap: 8px;">
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<span>📂 Dateien dieser Einheit:</span>
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||
</div>
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||
<div style="display: flex; gap: 10px; flex-wrap: wrap;">
|
||
<a href="aufgabe.py" class="btn" style="padding: 6px 14px; font-size: 0.88rem; background: var(--primary);" download>📄 aufgabe.py (Startercode)</a>
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||
<a href="test_aufgabe.py" class="btn btn-secondary" style="padding: 6px 14px; font-size: 0.88rem;" download>🧪 test_aufgabe.py (Tests)</a>
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||
<a href="musterloesung.py" class="btn btn-secondary" style="padding: 6px 14px; font-size: 0.88rem;" download>💡 musterloesung.py (Lösung)</a>
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||
<a href="README.md" class="btn btn-secondary" style="padding: 6px 14px; font-size: 0.88rem;">📖 README.md</a>
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||
</div>
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||
</div>
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||
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||
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<!-- 1. Das Problem mit Standard print -->
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<section class="card">
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<h2>1. Warum sieht <code>print(objekt)</code> standardmäßig so kryptisch aus?</h2>
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<p>
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Wenn du versuchst, ein Objekt ohne die Dunder-Methode <code>__str__</code> auszudrucken:
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</p>
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<div class="code-container">
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<pre><span class="var">mein_buch</span> = <span class="fn">Buch</span>(<span class="str">"Harry Potter"</span>, <span class="str">"J.K. Rowling"</span>)
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<span class="fn">print</span>(<span class="var">mein_buch</span>) <span class="cm"># Ausgabe: <__main__.Buch object at 0x7fa2b0485d90></span></pre>
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</div>
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<p>
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Python weiß nicht, welche Attribute für einen Menschen interessant sind.
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</p>
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<div class="box box-tipp">
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<div class="box-title">✨ Die Magie von <code>__str__</code>:</div>
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Sobald du in deiner Klasse die Methode <code>def __str__(self):</code> definierst, ruft Python diese automatisch auf, sobald das Objekt in Text umgewandelt werden soll (bei <code>print()</code>, <code>str()</code> oder in f-Strings <code>f"{objekt}"</code>)!
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</div>
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||
</section>
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<!-- 2. Vollständiges Beispiel: Pizza & Pizzeria -->
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<section class="card">
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<h2>2. 🍕 Vollständiges Beispiel: Pizza & Pizzeria-Bestellung</h2>
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<p>Hier siehst du zwei vollständige Klassen, die zusammenarbeiten: <code>Pizza</code> (mit <code>__str__</code>) und <code>Bestellung</code> (die eine Liste von Pizzen verwaltet):</p>
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<div class="code-container">
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<div class="code-header">
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<div class="code-dots">
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<span class="code-dot dot-red"></span>
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<span class="code-dot dot-yellow"></span>
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<span class="code-dot dot-green"></span>
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||
</div>
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<span>Python (Komplettes Beispiel: pizzeria.py)</span>
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||
</div>
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<pre><span class="cm"># ==============================================================================</span>
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<span class="cm"># KLASSE 1: Einzelne Pizza mit schöner __str__ Ausgabe</span>
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<span class="cm"># ==============================================================================</span>
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<span class="kw">class</span> <span class="fn">Pizza</span>:
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<span class="kw">def</span> <span class="fn">__init__</span>(<span class="var">self</span>, <span class="var">name</span>, <span class="var">preis</span>, <span class="var">extra_kaese</span>=<span class="kw">False</span>):
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<span class="var">self</span>.<span class="attr">name</span> = <span class="var">name</span>
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<span class="var">self</span>.<span class="attr">preis</span> = <span class="var">preis</span>
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<span class="var">self</span>.<span class="attr">extra_kaese</span> = <span class="var">extra_kaese</span>
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<span class="kw">if</span> <span class="var">extra_kaese</span>:
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<span class="var">self</span>.<span class="attr">preis</span> += <span class="num">1.50</span> <span class="cm"># Extra Käse kostet 1.50€ mehr</span>
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<span class="cm"># Diese Methode bestimmt, wie die Pizza als Text aussieht:</span>
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<span class="kw">def</span> <span class="fn">__str__</span>(<span class="var">self</span>):
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<span class="var">kaese_hinweis</span> = <span class="str">" (mit Extra-Käse 🧀)"</span> <span class="kw">if</span> <span class="var">self</span>.<span class="attr">extra_kaese</span> <span class="kw">else</span> <span class="str">""</span>
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<span class="kw">return</span> <span class="str">f"Pizza {self.name}{kaese_hinweis} - {self.preis:.2f} €"</span>
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<span class="cm"># ==============================================================================</span>
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<span class="cm"># KLASSE 2: Bestellung verwaltet eine Liste von Pizzen</span>
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<span class="cm"># ==============================================================================</span>
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<span class="kw">class</span> <span class="fn">Bestellung</span>:
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<span class="kw">def</span> <span class="fn">__init__</span>(<span class="var">self</span>, <span class="var">kunden_name</span>):
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<span class="var">self</span>.<span class="attr">kunden_name</span> = <span class="var">kunden_name</span>
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<span class="var">self</span>.<span class="attr">pizzen</span> = [] <span class="cm"># Startet mit einer leeren Liste</span>
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<span class="kw">def</span> <span class="fn">pizza_hinzufuegen</span>(<span class="var">self</span>, <span class="var">pizza</span>):
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<span class="var">self</span>.<span class="attr">pizzen</span>.<span class="fn">append</span>(<span class="var">pizza</span>)
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<span class="kw">def</span> <span class="fn">gesamtpreis</span>(<span class="var">self</span>):
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<span class="kw">return</span> <span class="fn">sum</span>(<span class="var">p</span>.<span class="attr">preis</span> <span class="kw">for</span> <span class="var">p</span> <span class="kw">in</span> <span class="var">self</span>.<span class="attr">pizzen</span>)
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<span class="kw">def</span> <span class="fn">rechnung_drucken</span>(<span class="var">self</span>):
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<span class="var">zeilen</span> = [<span class="str">f"=== RECHNUNG FÜR {self.kunden_name.upper()} ==="</span>]
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<span class="kw">for</span> <span class="var">p</span> <span class="kw">in</span> <span class="var">self</span>.<span class="attr">pizzen</span>:
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<span class="var">zeilen</span>.<span class="fn">append</span>(<span class="str">f"- {p}"</span>) <span class="cm"># Hier wird automatisch p.__str__() aufgerufen!</span>
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<span class="var">zeilen</span>.<span class="fn">append</span>(<span class="str">"--------------------------------"</span>)
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<span class="var">zeilen</span>.<span class="fn">append</span>(<span class="str">f"Gesamtsumme: {self.gesamtpreis():.2f} €"</span>)
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<span class="kw">return</span> <span class="str">"\n"</span>.<span class="fn">join</span>(<span class="var">zeilen</span>)
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<span class="cm"># Ausprobieren:</span>
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<span class="kw">if</span> <span class="var">__name__</span> == <span class="str">"__main__"</span>:
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<span class="var">bestellung</span> = <span class="fn">Bestellung</span>(<span class="str">"Lisa"</span>)
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<span class="var">p1</span> = <span class="fn">Pizza</span>(<span class="str">"Margherita"</span>, <span class="num">8.50</span>)
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<span class="var">p2</span> = <span class="fn">Pizza</span>(<span class="str">"Salami"</span>, <span class="num">9.50</span>, <span class="var">extra_kaese</span>=<span class="kw">True</span>)
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<span class="var">bestellung</span>.<span class="fn">pizza_hinzufuegen</span>(<span class="var">p1</span>)
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<span class="var">bestellung</span>.<span class="fn">pizza_hinzufuegen</span>(<span class="var">p2</span>)
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|
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<span class="fn">print</span>(<span class="var">bestellung</span>.<span class="fn">rechnung_drucken</span>())</pre>
|
||
</div>
|
||
</section>
|
||
|
||
<!-- 3. Stolperfallen -->
|
||
<section class="card">
|
||
<h2>3. ⚠️ Wichtig bei <code>__str__</code></h2>
|
||
|
||
<div class="box box-danger">
|
||
<div class="box-title">1. Immer 'return', niemals 'print'!</div>
|
||
<code>def __str__(self): return f"..."</code> ✓<br>
|
||
<code>def __str__(self): print(f"...")</code> ✗ (Falsch! <code>__str__</code> MUSS einen String mit <code>return</code> zurückgeben!)
|
||
</div>
|
||
|
||
<div class="box box-warning">
|
||
<div class="box-title">2. Rückgabewert muss zwingend ein String sein:</div>
|
||
Wenn du eine Zahl zurückgibst (z.B. <code>return self.preis</code>), stürzt Python ab mit <code>TypeError: __str__ returned non-string</code>. Nutze immer f-Strings <code>f"{self.preis}"</code> oder <code>str(...)</code>.
|
||
</div>
|
||
</section>
|
||
|
||
<!-- 4. Aufgaben Card -->
|
||
<section class="card">
|
||
<h2>4. 🎯 Deine Aufgaben in <code><a href="aufgabe.py" style="color: inherit; text-decoration: underline;">aufgabe.py</a></code></h2>
|
||
|
||
<ul class="task-list">
|
||
<li class="task-item">
|
||
<input type="checkbox" class="task-checkbox" id="t4_1">
|
||
<label for="t4_1" class="task-label">
|
||
<strong>TODO 1:</strong> <code>Artikel.__init__(self, name, preis, anzahl=1)</code>.
|
||
</label>
|
||
</li>
|
||
<li class="task-item">
|
||
<input type="checkbox" class="task-checkbox" id="t4_2">
|
||
<label for="t4_2" class="task-label">
|
||
<strong>TODO 2:</strong> <code>Artikel.gesamtpreis(self)</code> -> <code>self.preis * self.anzahl</code>.
|
||
</label>
|
||
</li>
|
||
<li class="task-item">
|
||
<input type="checkbox" class="task-checkbox" id="t4_3">
|
||
<label for="t4_3" class="task-label">
|
||
<strong>TODO 3:</strong> <code>Artikel.__str__(self)</code> -> <code>"{anzahl}x {name} (je {preis:.2f} €) = {gesamtpreis:.2f} €"</code>.
|
||
</label>
|
||
</li>
|
||
<li class="task-item">
|
||
<input type="checkbox" class="task-checkbox" id="t4_4">
|
||
<label for="t4_4" class="task-label">
|
||
<strong>TODO 4-7:</strong> <code>Warenkorb</code> mit <code>artikel_hinzufuegen</code>, <code>gesamtsumme</code> und <code>bon_text</code>.
|
||
</label>
|
||
</li>
|
||
</ul>
|
||
|
||
<h3>💡 Lösungshinweise (Aufklappen bei Bedarf)</h3>
|
||
|
||
<details>
|
||
<summary>🔍 Tipp zu TODO 7 (Kassenzettel zusammensetzen)</summary>
|
||
<div class="details-content">
|
||
<div class="code-container">
|
||
<pre><span class="kw">def</span> <span class="fn">bon_text</span>(<span class="var">self</span>):
|
||
<span class="var">zeilen</span> = [<span class="str">"--- KASSENZETTEL ---"</span>]
|
||
<span class="kw">for</span> <span class="var">artikel</span> <span class="kw">in</span> <span class="var">self</span>.<span class="attr">artikel_liste</span>:
|
||
<span class="var">zeilen</span>.<span class="fn">append</span>(<span class="fn">str</span>(<span class="var">artikel</span>)) <span class="cm"># Nutzt automatisch __str__ des Artikels!</span>
|
||
<span class="var">zeilen</span>.<span class="fn">append</span>(<span class="str">"--------------------"</span>)
|
||
<span class="var">zeilen</span>.<span class="fn">append</span>(<span class="str">f"Gesamtsumme: {self.gesamtsumme():.2f} €"</span>)
|
||
<span class="kw">return</span> <span class="str">"\n"</span>.<span class="fn">join</span>(<span class="var">zeilen</span>)</pre>
|
||
</div>
|
||
</div>
|
||
</details>
|
||
</section>
|
||
|
||
<!-- 5. Testen & Navigation -->
|
||
<section class="card">
|
||
<h2>5. 🧪 Lösung überprüfen</h2>
|
||
<p>Führe im Terminal im Ordner <code>04_str_und_darstellung</code> folgenden Befehl aus:</p>
|
||
<div class="code-container">
|
||
<div class="code-header">
|
||
<span>Terminal</span>
|
||
</div>
|
||
<pre><code>python3 test_aufgabe.py</code></pre>
|
||
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|
||
|
||
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|
||
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<a href="../04b_umstieg_vscode/index.html" class="btn">Weiter zu Kapitel 04b: VS Code 🚀 →</a>
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